Edexcel IGCSE Chemistry - Paper 1
Exam Questions & Answers
Potassium manganate (VII) and water (purple colour spreads), ammonia and hydrogen chloride
(white ring forms closer to hydrogen chloride), bromine gas and air (brown bromine gas
diffuses) - ANSWERS3 experiments to show diffusion
4OH- = O2 + 2H2O + 4E- - ANSWERSHalf equation for hydroxide ions
Moves slowly (on the surface), fizzes, eventually disappears - ANSWERSLithium with water -
observations
Moves quickly (on the surface), fizzes rapidly, may ignite - ANSWERSSodium with water -
observations
Reacts vigorously, burns with a lilac flame, sometimes explodes - ANSWERSPotassium with
water - observations
Heat copper (in a tube and pass air over it) - ANSWERSExperiment to test the proportion of
oxygen in air
Pale blue - ANSWERSSulfur flame colour
Orange/yellow - ANSWERSCarbon flame colour
Downward delivery (it is denser than air) - ANSWERSHow to collect chlorine
, 2H2O + CaCO3 = CaCl2 + H2O + CO2 - ANSWERSHow to make CO2 in a lab (equation)
It is soluble in water - ANSWERSWhy can CO2 be used in fizzy drinks?
Platinum wire, dip in hydrochloric acid, hold in flame - ANSWERSFlame test wire to use + how to
sterilise it
So the gas can dissolve and make the colour change - ANSWERSWhy does litmus paper need to
be damp when testing a gas?
Hydrochloric acid - ANSWERSAcid added to remove any impurities for the sulphate test
Nitric acid - ANSWERSAcid added to remove any impurities for the halide test
Bleaches damp litmus paper white - ANSWERSTest for chlorine
A group of organic compounds that can all be represented by the same general formula -
ANSWERSHomologous series
Similar chemical properties, a trend in physical properties (boiling points, colour, viscosity) -
ANSWERSMembers of the same homologous series have...
A group of atoms which are arranged or bonded in a particular way and which determine how
an organic compound will react - ANSWERSFunctional group
Carbon to hydrogen bond - ANSWERSAlkane functional group
Carbon double bond - ANSWERSAlkene functional group
Exam Questions & Answers
Potassium manganate (VII) and water (purple colour spreads), ammonia and hydrogen chloride
(white ring forms closer to hydrogen chloride), bromine gas and air (brown bromine gas
diffuses) - ANSWERS3 experiments to show diffusion
4OH- = O2 + 2H2O + 4E- - ANSWERSHalf equation for hydroxide ions
Moves slowly (on the surface), fizzes, eventually disappears - ANSWERSLithium with water -
observations
Moves quickly (on the surface), fizzes rapidly, may ignite - ANSWERSSodium with water -
observations
Reacts vigorously, burns with a lilac flame, sometimes explodes - ANSWERSPotassium with
water - observations
Heat copper (in a tube and pass air over it) - ANSWERSExperiment to test the proportion of
oxygen in air
Pale blue - ANSWERSSulfur flame colour
Orange/yellow - ANSWERSCarbon flame colour
Downward delivery (it is denser than air) - ANSWERSHow to collect chlorine
, 2H2O + CaCO3 = CaCl2 + H2O + CO2 - ANSWERSHow to make CO2 in a lab (equation)
It is soluble in water - ANSWERSWhy can CO2 be used in fizzy drinks?
Platinum wire, dip in hydrochloric acid, hold in flame - ANSWERSFlame test wire to use + how to
sterilise it
So the gas can dissolve and make the colour change - ANSWERSWhy does litmus paper need to
be damp when testing a gas?
Hydrochloric acid - ANSWERSAcid added to remove any impurities for the sulphate test
Nitric acid - ANSWERSAcid added to remove any impurities for the halide test
Bleaches damp litmus paper white - ANSWERSTest for chlorine
A group of organic compounds that can all be represented by the same general formula -
ANSWERSHomologous series
Similar chemical properties, a trend in physical properties (boiling points, colour, viscosity) -
ANSWERSMembers of the same homologous series have...
A group of atoms which are arranged or bonded in a particular way and which determine how
an organic compound will react - ANSWERSFunctional group
Carbon to hydrogen bond - ANSWERSAlkane functional group
Carbon double bond - ANSWERSAlkene functional group
